Began converting d3/scale
Converting d3/scale
d3/scale ordinal and nice
Shortened function aliasing in underscore
Simplified d3 Scale interfaces; converted ThresholdScale
REMOVED d3/core/class.ts; converted d3 Map and Set
Added overload signatures to d3/arrays; began implementing Nest
Impl d3/Nest
Merge branch 'master' into core-arrays-ben

Conflicts:
	d3/src-ts/arrays/mean.ts
Merge pull request #3 from UCSD-PL/core-arrays-ben

JS->TS in d3 /scale, /arrays, and /interpolate